Evaporator



1932. J. M KEAsuE EVAPORATOR Filed larch 3. 1930 Patented Oct. 1932 UNITED JAMES MOKEAGUE, OI GHDCAGO, ILLENOIS, ASSIGNOB, BY HEBNE ASHiGNEENTE, W

ZEROZCNE, INCQRPGBATED, OF CHICAGO, ILLINQIS, A GOEIOBATIQN 0h DELAW nveeonneon.

Mipliontion met with e, nee. eerie ho. teem This invention relates te impreveinente in hoiiei'e enri has :Eer its dPtfillCiPhl ehjeet the prednetion of a new an improved heiiee e1 eeoiing unit for a meehenicei teitiggeteting eyetem. v

in meehenicai ."t'etrigereting e eteine the eeeiin unit disposer} in the tetrigeintoe he eeoed hy the system nsneiiy eeinptieee hotinontel them out hi the hottoin ei" Whieh nee ied e phlreiity of einenieting ceiie thtengh "Whieh heat in the hon: is etteevn into the he iieigerent in the unit. A eeinpeeeeee nnit is eeepteyeti to withdrew the tenet ten. hy the heiiing oi the i'etni g'etent in he eeei-= nnit iii-em thet unit te e pi'eee it eireniete it thi'engh eoeiine; ineeii in to eentett it into iiq nitih Whieh it; then tntneti he the eoehng unit h y eeni'gneeeet.

in stem of this hind. the hetire kttti. thsnin et' eiiet ie nneinteineei ieity tinii we gevei'hingg" the edinieeien iiqnitt inte 7 e nni't, hi'etinenti e eeinpteeeee pieyeci to Withetnetv the gee item the nnit te withdrew the teem e nninhelt eeoiinn; units in "whet e e eensystem, other is indivietnei the nnit in'the eo-eeiied ine'tit'i tin heth et these systems, eii te n tiente the pieton eyiinetet "ti nits th :e 60m" pteeeer tincts ite way inte tiqniti eeiteigee ent enet ie emnieeei Withthet iinniti enei returned te the eeeiine" nnit thetewith. in the wetting unit the eif entt teitigeieht eepetete end since the ei-i ie tighter then i'etrigei'nnt it coiieete as e hint then the set time (it the liquid This eii tetine e, hienhet even the em'ieee et the iiqttifi erect the time enee oi this hienhet Tufiiiflitiih the etepetetien oi the reirigerent enti eeneettnentiy the thetvei nit heet teeth the thete h3g1" diminished.

it he errangen'lente hie mettle tee with dinning the fihn et eii item the entieee oi the refrigerant in the eeoiing' unit, thet unit rtviii eoon become eii honed. heeenee the fihn he eict retiigerent h e fleet eonteoiiett hut Witt eieh he the eii them the everceme thie eemhtien, verions tievieee, eit went-1 ern eevene heve heeetefei'e heen em toyed to shim the him ext eii item the inn! ihee ef the i'etriget'ent end te return it to the eempee'eeee with the gee Withehewn troin'the nnit,

he eetnngement eit this hind eetieteetor t' oniy es iengtg es it ie en ehie et withtitnninng eii item the unit Wit nut piehine; t e en} iiqnit IEtliiightm'tih it hqniei i'etnigerent ie piehec'i np thet iettigetent is tepenieeii' in the pipes ieectin te eenipteeeee with the te enit thet the tempeieteee e1? those ieelncect heiow the mien point mt meietnte hit ie eeiteeteti en them in 'ihht'ttt'i et den 01" .1 eeti hen the eeinptteeeet "'2 ehnt etetvh this "host ineite enti thnpe nee toenieti e the pipes the wetting; end 'ieii injinte the tie the in the White hit the wet-hit; retest in the n ineiinidie 1 ettengen "Wit e" hep'pehe igg'etent i tutti 'lflhittl dhtitttty when tine! heit when eit is he the et he iieni eient ie. the epeee ehet'e it v "hi this eggtitntien teeqnentiy the iieniti inte engegenient with the ehnneeine" tiet'iee with thet the iiqnih in tnehett t e eitnn h inte the snetien eystem' it my :tlt'ztehfitth ihtentien iihete piethieti en tee pneetneine; eene quiet eci ieeent ttetiee ee even when the i'eiiigetent heiiing vieientiy etiinnriet" Witt net *pieh he iieniei geeent eneteee et thet iieinieh New te eeenieint theee ehiiieti in tn "With the teeehinge eat my int'entien, teietenee is ineeie te the eeeeinpenyingchewing in which e eteietied einhediinent ot it is ehetni ht Why eat" enenipie nnei in which:

Figure ft is e ei-oee eectienei View tehen ioegltueiineiiy threngh e heiiei";

Figure 2 ie en end view et the hoiiee;

Figure 3 is a cross sectional view taken along the line 3 of Figure 1'; and- Figure 4 is a perspective view of the suction pipe and baflle.

Referring to the drawing in more detail, the boilercomprises the cylindrical drum 1 which is rolled into groove 2 in the ring 3 valve 6 and the pressure port and valve 7,

which valves may be varied within the tea'chings of my invention. The suction line, not shown, is connected to the suction valve 6 and the pressure line to the pressure valve 7, these lines leading to a compressor unit, not shown, to permit it to operate the cooling unit in the usual manner.

In Figure 2 the pressure valve 7 is shown in cross section and comprises the pressure.

line 8 leading from the compressor to the valve seat member 9 through which it is attached by the union 10. The valve seatniember 9 opens into a chamber 11 which communicates with the inside of the drum through the port 12. A valve 13 is threaded into thewalls of this chamber 11 at the opposite end by the thread 14 and operable thereon to engage the valveseat 9 to close the chamber 11 from the pipe 8. The valve 13 is operated by the square shank 15 which is normally encased by a cap nut 16, that cap nut beingremovable when it is necessary to close the valve.

Within the drum 1 is a needle valve 17 which is operated by float 18 to open or close the port 12 leading into the drum. The float 18 controls the valve 17 to regulate the height of the liquid 19 in the drum:

The liquid refrigerant 19 is covered with a film of oil 20, that film being the oil that it is desired to skim from the unit. a

The suction valve 6 leads through a port 21 to the suction pipe 22 which comprises a horizontal portion 23 and a curved portion 24 leading to the open end 25 which is disposed.

head 4 is prevented from disturbing the skimnear the top of the drum 1. An oil skimming port 26 is disposed in the horizontal portion 23 of suction pipe 22 and when the float 18 is properly adjusted the liquid level in the drum ismaintained atsuch a height that the port 26 is disposed in the upper part of the film of oil 20.

A baflle 30 is attached to the horizontal portion 23 of the suction pipe and comprises a planar portion 31 extending horizontally out from the suction pipe just below the skimming port 26. The battle also comprises verr tical members 32 and 33 located on opposite ends of the horizontal portion 31 and on opposite sides of the skimming port 26. Preferably the baflle 32 adjacent the end plate 4 of the drum is higher than the other vertical haflle 33, extending well above the horizontal portion 23 of the suction pipe.

As will be noted in Figure 3, the suction pipe 22 is located to one side of the vertical center line of the drum 1, and the needle valve 17 and float 18 are located centrally in the drum. The battle 30 extends from the suction pipe 22 toward and beyond the center line of the drum so that it is disposed directly above a needle valve 17.

In operation, the escape of vaporized refrigerant, or so called boiling of the refrigerant in the drum, takes place most violently immediately above the opening leading from the circulating coils into the drum. In devices of this kind now generally on the market these openings are located near the bottom of the drum and on opposite sides of the center line of it so that the gas rising through the liquid refrigerant follows a path near the outside of the drum. The particular location of the points of entry of the cooling coils into the drum may be varied within the teachings of my invention and for that reason no particular form. has been shown in the drawing.

The agitation of the liquid refrigerant caused by this movement of gas through it is prevented from disturbing the oil film adjacent the skimming port 26 by the horizontal portion 23 of the suction pipe 22 and by the horizontal portion 31 of the baflle extending from that pipe on the side containingJ the skimming port. Since the horizontal aflie extends well beyond the center line of the drum, it is effective to maintain a relatively large quiet area adjacent the skimming port 26. The upturned end 33 of the bafile aids in maintaining this zone of quiet.

Some boiling also occurs around the needle valve due to the movement of liquid refrigerant from the high pressure line 8 to the lower pressure interior chamber of the drum 1, the gas so formed rising vertically from the needle valve is prevented from disturbing the oil film in the skimming area by the high vertical portion 32 of the 'baflie. Violent b011- ing in the end of the drum away from the ming area by the float 18 with the assistance of the vertical portion 33 of the bafile. The liquid in the skimming area above the horizontal porton 31 of the battle moves with unidirectional motion through the open end of the area and toward the skimming port 26. This motion is slow because the cross sectional area of the port 26 is relatively small in comparison to the cross sectional area of the skimming area, and as a result the oil is completely separated from the refrigerant and collected upon the top thereof. I have a liquid refrigerant therein, means for maintaimn said liquid at a predetermined level in the oiler, said liquid being vaporized and the gas so formed permitted to rise to the top of theboiler, there being a film of oil on the surface of said liquid which is agitated by the bubbles of gas passing through it, a suction pipe extending into said drum to with draw the gas from it and having an oil skimming port imbedded in said film, and means including a battle supported on said pipe comprising a portion extending horizontally from said pipe below said port and vertical tion pipe in said drum which is located to one side of the center thereof and is partly submer ed in said liquid, said pipe containing a skimming port located in said submerged portion and opening toward the center of said drum, a baflle attached to said submerged portion of said pipe and extending horizontally therefrom beyond the center of said drum, vertical side pieces on said bafile extending upwardly therefrom, said bafiie forming a basin closed at one end by said pipe and on opposite sides by said side pieces, said liquid moving into said basin through the open end thereof with unidirectional movement to permit it being skimmed through said port.

In witness whereof, I hereunto subscribe my name this day of Feb., 1930.

JAMES MGKEAGUE.

portions disposed on opposite sides of said port, said baflie defining a shallow basin closed on one end by said suction pipe for preventing agitation of said film adjacent said port to prevent drawing liquid refrigerant through said port with said oil.

2. In a mechanical refrigerating unit, the combination with a boiler drum in which a liquid refrigerant is maintained at a certain height by a float controlled valve, a suction pipe in said drum which is partly submerged in said liquid and contains a port in its submerged portion just below the surface of said liquid, of a bafile including a horizontal portion located beneath said port and attached to said pipe and vertical portions disposed on opposite sides of said port attached to said pipe, one of said vertical portions extending above the pipe to shield said port from liquid rising from said valve.

3. In a mechanical refrigerating unit, the combination with a boiler drum in which a liquid refrigerant is maintained at a certain height by a float controlled valve, of asuction pipe in said drum which is partly submerged in said liquid and contains a skimming port in its submerged portion just below the surface of said liquid, a bafiie attached to said pipe and including a horizontal portion located beneath said port and vertical portions disposed on opposite sides of said port, said bafie forming a basin. which is closed at the bottom and on two sides by said baffle and on one end by said pipe, saiqL liquid filling said basin to permit its being skimmed through said port. A

4. In a mechanical refrigerating unit, the combination with a boiler drum in which a liquid refrigerant is maintained at a certain height by a float controlled valve, of a suc- 

